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NIF, the facility that just produced the first positive-gain fusion reaction, was completed in 2009 at a cost of about $4.2B. It costs about $300M/year to run. So total cost to date is about $8.1B. The experiment that produced the fusion reaction had a net gain of about 1.1MJ energy.

That works out to about $19.44B per kilowatthour.

They plan to reduce the cost per kWh before they go into production. 😂

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